1 /* Internal interfaces for the GNU/Linux specific target code for gdbserver.
2 Copyright (C) 2002-2020 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
19 #ifndef GDBSERVER_LINUX_LOW_H
20 #define GDBSERVER_LINUX_LOW_H
22 #include "nat/linux-nat.h"
23 #include "nat/gdb_thread_db.h"
26 #include "gdbthread.h"
27 #include "gdb_proc_service.h"
29 /* Included for ptrace type definitions. */
30 #include "nat/linux-ptrace.h"
31 #include "target/waitstatus.h" /* For enum target_stop_reason. */
32 #include "tracepoint.h"
34 #define PTRACE_XFER_TYPE long
36 #ifdef HAVE_LINUX_REGSETS
37 typedef void (*regset_fill_func
) (struct regcache
*, void *);
38 typedef void (*regset_store_func
) (struct regcache
*, const void *);
43 OPTIONAL_REGS
, /* Do not error if the regset cannot be accessed. */
46 /* The arch's regsets array initializer must be terminated with a NULL
49 { 0, 0, 0, -1, (enum regset_type) -1, NULL, NULL }
53 int get_request
, set_request
;
54 /* If NT_TYPE isn't 0, it will be passed to ptrace as the 3rd
55 argument and the 4th argument should be "const struct iovec *". */
58 enum regset_type type
;
59 regset_fill_func fill_function
;
60 regset_store_func store_function
;
63 /* Aggregation of all the supported regsets of a given
68 /* The regsets array. */
69 struct regset_info
*regsets
;
71 /* The number of regsets in the REGSETS array. */
74 /* If we get EIO on a regset, do not try it again. Note the set of
75 supported regsets may depend on processor mode on biarch
76 machines. This is a (lazily allocated) array holding one boolean
77 byte (0/1) per regset, with each element corresponding to the
78 regset in the REGSETS array above at the same offset. */
79 char *disabled_regsets
;
84 /* Mapping between the general-purpose registers in `struct user'
85 format and GDB's register array layout. */
89 /* The number of registers accessible. */
92 /* The registers map. */
96 /* All info needed to access an architecture/mode's registers. */
100 /* Regset support bitmap: 1 for registers that are transferred as a part
101 of a regset, 0 for ones that need to be handled individually. This
102 can be NULL if all registers are transferred with regsets or regsets
103 are not supported. */
104 unsigned char *regset_bitmap
;
106 /* Info used when accessing registers with PTRACE_PEEKUSER /
107 PTRACE_POKEUSER. This can be NULL if all registers are
108 transferred with regsets .*/
109 struct usrregs_info
*usrregs
;
111 #ifdef HAVE_LINUX_REGSETS
112 /* Info used when accessing registers with regsets. */
113 struct regsets_info
*regsets_info
;
117 struct process_info_private
119 /* Arch-specific additions. */
120 struct arch_process_info
*arch_private
;
122 /* libthread_db-specific additions. Not NULL if this process has loaded
123 thread_db, and it is active. */
124 struct thread_db
*thread_db
;
126 /* &_r_debug. 0 if not yet determined. -1 if no PT_DYNAMIC in Phdrs. */
132 struct linux_target_ops
134 /* Returns true if the low target supports tracepoints. */
135 int (*supports_tracepoints
) (void);
137 /* Fill ADDRP with the thread area address of LWPID. Returns 0 on
138 success, -1 on failure. */
139 int (*get_thread_area
) (int lwpid
, CORE_ADDR
*addrp
);
141 /* Install a fast tracepoint jump pad. See target.h for
143 int (*install_fast_tracepoint_jump_pad
) (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
147 CORE_ADDR
*jump_entry
,
148 CORE_ADDR
*trampoline
,
149 ULONGEST
*trampoline_size
,
150 unsigned char *jjump_pad_insn
,
151 ULONGEST
*jjump_pad_insn_size
,
152 CORE_ADDR
*adjusted_insn_addr
,
153 CORE_ADDR
*adjusted_insn_addr_end
,
156 /* Return the bytecode operations vector for the current inferior.
157 Returns NULL if bytecode compilation is not supported. */
158 struct emit_ops
*(*emit_ops
) (void);
160 /* Return the minimum length of an instruction that can be safely overwritten
161 for use as a fast tracepoint. */
162 int (*get_min_fast_tracepoint_insn_len
) (void);
164 /* Returns true if the low target supports range stepping. */
165 int (*supports_range_stepping
) (void);
168 int (*supports_hardware_single_step
) (void);
170 /* Fill *SYSNO with the syscall nr trapped. Only to be called when
171 inferior is stopped due to SYSCALL_SIGTRAP. */
172 void (*get_syscall_trapinfo
) (struct regcache
*regcache
, int *sysno
);
175 int (*get_ipa_tdesc_idx
) (void);
178 extern struct linux_target_ops the_low_target
;
180 /* Target ops definitions for a Linux target. */
182 class linux_process_target
: public process_stratum_target
186 int create_inferior (const char *program
,
187 const std::vector
<char *> &program_args
) override
;
189 void post_create_inferior () override
;
191 int attach (unsigned long pid
) override
;
193 int kill (process_info
*proc
) override
;
195 int detach (process_info
*proc
) override
;
197 void mourn (process_info
*proc
) override
;
199 void join (int pid
) override
;
201 bool thread_alive (ptid_t pid
) override
;
203 void resume (thread_resume
*resume_info
, size_t n
) override
;
205 ptid_t
wait (ptid_t ptid
, target_waitstatus
*status
,
206 int options
) override
;
208 void fetch_registers (regcache
*regcache
, int regno
) override
;
210 void store_registers (regcache
*regcache
, int regno
) override
;
212 int prepare_to_access_memory () override
;
214 void done_accessing_memory () override
;
216 int read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
,
219 int write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
,
222 void look_up_symbols () override
;
224 void request_interrupt () override
;
226 bool supports_read_auxv () override
;
228 int read_auxv (CORE_ADDR offset
, unsigned char *myaddr
,
229 unsigned int len
) override
;
231 int insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
232 int size
, raw_breakpoint
*bp
) override
;
234 int remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
235 int size
, raw_breakpoint
*bp
) override
;
237 bool stopped_by_sw_breakpoint () override
;
239 bool supports_stopped_by_sw_breakpoint () override
;
241 bool stopped_by_hw_breakpoint () override
;
243 bool supports_stopped_by_hw_breakpoint () override
;
245 bool supports_hardware_single_step () override
;
247 bool stopped_by_watchpoint () override
;
249 CORE_ADDR
stopped_data_address () override
;
251 bool supports_read_offsets () override
;
253 int read_offsets (CORE_ADDR
*text
, CORE_ADDR
*data
) override
;
255 bool supports_get_tls_address () override
;
257 int get_tls_address (thread_info
*thread
, CORE_ADDR offset
,
258 CORE_ADDR load_module
, CORE_ADDR
*address
) override
;
260 bool supports_qxfer_osdata () override
;
262 int qxfer_osdata (const char *annex
, unsigned char *readbuf
,
263 unsigned const char *writebuf
,
264 CORE_ADDR offset
, int len
) override
;
266 bool supports_qxfer_siginfo () override
;
268 int qxfer_siginfo (const char *annex
, unsigned char *readbuf
,
269 unsigned const char *writebuf
,
270 CORE_ADDR offset
, int len
) override
;
272 bool supports_non_stop () override
;
274 bool async (bool enable
) override
;
276 int start_non_stop (bool enable
) override
;
278 bool supports_multi_process () override
;
280 bool supports_fork_events () override
;
282 bool supports_vfork_events () override
;
284 bool supports_exec_events () override
;
286 void handle_new_gdb_connection () override
;
288 int handle_monitor_command (char *mon
) override
;
290 int core_of_thread (ptid_t ptid
) override
;
292 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
293 bool supports_read_loadmap () override
;
295 int read_loadmap (const char *annex
, CORE_ADDR offset
,
296 unsigned char *myaddr
, unsigned int len
) override
;
299 bool supports_tracepoints () override
;
301 CORE_ADDR
read_pc (regcache
*regcache
) override
;
303 void write_pc (regcache
*regcache
, CORE_ADDR pc
) override
;
305 bool supports_thread_stopped () override
;
307 bool thread_stopped (thread_info
*thread
) override
;
309 void pause_all (bool freeze
) override
;
311 void unpause_all (bool unfreeze
) override
;
313 void stabilize_threads () override
;
315 bool supports_fast_tracepoints () override
;
317 int install_fast_tracepoint_jump_pad (CORE_ADDR tpoint
,
322 CORE_ADDR
*jump_entry
,
323 CORE_ADDR
*trampoline
,
324 ULONGEST
*trampoline_size
,
325 unsigned char *jjump_pad_insn
,
326 ULONGEST
*jjump_pad_insn_size
,
327 CORE_ADDR
*adjusted_insn_addr
,
328 CORE_ADDR
*adjusted_insn_addr_end
,
331 int get_min_fast_tracepoint_insn_len () override
;
333 struct emit_ops
*emit_ops () override
;
335 bool supports_disable_randomization () override
;
337 bool supports_qxfer_libraries_svr4 () override
;
339 int qxfer_libraries_svr4 (const char *annex
,
340 unsigned char *readbuf
,
341 unsigned const char *writebuf
,
342 CORE_ADDR offset
, int len
) override
;
344 bool supports_agent () override
;
346 #ifdef HAVE_LINUX_BTRACE
347 btrace_target_info
*enable_btrace (ptid_t ptid
,
348 const btrace_config
*conf
) override
;
350 int disable_btrace (btrace_target_info
*tinfo
) override
;
352 int read_btrace (btrace_target_info
*tinfo
, buffer
*buf
,
353 enum btrace_read_type type
) override
;
355 int read_btrace_conf (const btrace_target_info
*tinfo
,
356 buffer
*buf
) override
;
359 bool supports_range_stepping () override
;
361 bool supports_pid_to_exec_file () override
;
363 char *pid_to_exec_file (int pid
) override
;
365 bool supports_multifs () override
;
367 int multifs_open (int pid
, const char *filename
, int flags
,
368 mode_t mode
) override
;
370 int multifs_unlink (int pid
, const char *filename
) override
;
372 ssize_t
multifs_readlink (int pid
, const char *filename
, char *buf
,
373 size_t bufsiz
) override
;
375 const char *thread_name (ptid_t thread
) override
;
378 bool thread_handle (ptid_t ptid
, gdb_byte
**handle
,
379 int *handle_len
) override
;
382 bool supports_catch_syscall () override
;
384 int get_ipa_tdesc_idx () override
;
386 /* Return the information to access registers. This has public
387 visibility because proc-service uses it. */
388 virtual const regs_info
*get_regs_info () = 0;
392 /* Handle a GNU/Linux extended wait response. If we see a clone,
393 fork, or vfork event, we need to add the new LWP to our list
394 (and return 0 so as not to report the trap to higher layers).
395 If we see an exec event, we will modify ORIG_EVENT_LWP to point
396 to a new LWP representing the new program. */
397 int handle_extended_wait (lwp_info
**orig_event_lwp
, int wstat
);
399 /* Do low-level handling of the event, and check if we should go on
400 and pass it to caller code. Return the affected lwp if we are, or
402 lwp_info
*filter_event (int lwpid
, int wstat
);
404 /* Wait for an event from child(ren) WAIT_PTID, and return any that
405 match FILTER_PTID (leaving others pending). The PTIDs can be:
406 minus_one_ptid, to specify any child; a pid PTID, specifying all
407 lwps of a thread group; or a PTID representing a single lwp. Store
408 the stop status through the status pointer WSTAT. OPTIONS is
409 passed to the waitpid call. Return 0 if no event was found and
410 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
411 was found. Return the PID of the stopped child otherwise. */
412 int wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
413 int *wstatp
, int options
);
415 /* Wait for an event from child(ren) PTID. PTIDs can be:
416 minus_one_ptid, to specify any child; a pid PTID, specifying all
417 lwps of a thread group; or a PTID representing a single lwp. Store
418 the stop status through the status pointer WSTAT. OPTIONS is
419 passed to the waitpid call. Return 0 if no event was found and
420 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
421 was found. Return the PID of the stopped child otherwise. */
422 int wait_for_event (ptid_t ptid
, int *wstatp
, int options
);
424 /* Wait for all children to stop for the SIGSTOPs we just queued. */
425 void wait_for_sigstop ();
427 /* Wait for process, returns status. */
428 ptid_t
wait_1 (ptid_t ptid
, target_waitstatus
*ourstatus
,
431 /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
432 If SUSPEND, then also increase the suspend count of every LWP,
434 void stop_all_lwps (int suspend
, lwp_info
*except
);
436 /* Stopped LWPs that the client wanted to be running, that don't have
437 pending statuses, are set to run again, except for EXCEPT, if not
438 NULL. This undoes a stop_all_lwps call. */
439 void unstop_all_lwps (int unsuspend
, lwp_info
*except
);
441 /* Start a step-over operation on LWP. When LWP stopped at a
442 breakpoint, to make progress, we need to remove the breakpoint out
443 of the way. If we let other threads run while we do that, they may
444 pass by the breakpoint location and miss hitting it. To avoid
445 that, a step-over momentarily stops all threads while LWP is
446 single-stepped by either hardware or software while the breakpoint
447 is temporarily uninserted from the inferior. When the single-step
448 finishes, we reinsert the breakpoint, and let all threads that are
449 supposed to be running, run again. */
450 void start_step_over (lwp_info
*lwp
);
452 /* If there's a step over in progress, wait until all threads stop
453 (that is, until the stepping thread finishes its step), and
454 unsuspend all lwps. The stepping thread ends with its status
455 pending, which is processed later when we get back to processing
457 void complete_ongoing_step_over ();
459 /* When we finish a step-over, set threads running again. If there's
460 another thread that may need a step-over, now's the time to start
461 it. Eventually, we'll move all threads past their breakpoints. */
462 void proceed_all_lwps ();
464 /* The reason we resume in the caller, is because we want to be able
465 to pass lwp->status_pending as WSTAT, and we need to clear
466 status_pending_p before resuming, otherwise, resume_one_lwp
467 refuses to resume. */
468 bool maybe_move_out_of_jump_pad (lwp_info
*lwp
, int *wstat
);
470 /* Move THREAD out of the jump pad. */
471 void move_out_of_jump_pad (thread_info
*thread
);
473 /* Call low_arch_setup on THREAD. */
474 void arch_setup_thread (thread_info
*thread
);
476 #ifdef HAVE_LINUX_USRREGS
477 /* Fetch one register. */
478 void fetch_register (const usrregs_info
*usrregs
, regcache
*regcache
,
481 /* Store one register. */
482 void store_register (const usrregs_info
*usrregs
, regcache
*regcache
,
486 /* Fetch all registers, or just one, from the child process.
487 If REGNO is -1, do this for all registers, skipping any that are
488 assumed to have been retrieved by regsets_fetch_inferior_registers,
489 unless ALL is non-zero.
490 Otherwise, REGNO specifies which register (so we can save time). */
491 void usr_fetch_inferior_registers (const regs_info
*regs_info
,
492 regcache
*regcache
, int regno
, int all
);
494 /* Store our register values back into the inferior.
495 If REGNO is -1, do this for all registers, skipping any that are
496 assumed to have been saved by regsets_store_inferior_registers,
497 unless ALL is non-zero.
498 Otherwise, REGNO specifies which register (so we can save time). */
499 void usr_store_inferior_registers (const regs_info
*regs_info
,
500 regcache
*regcache
, int regno
, int all
);
502 /* Return the PC as read from the regcache of LWP, without any
504 CORE_ADDR
get_pc (lwp_info
*lwp
);
506 /* Called when the LWP stopped for a signal/trap. If it stopped for a
507 trap check what caused it (breakpoint, watchpoint, trace, etc.),
508 and save the result in the LWP's stop_reason field. If it stopped
509 for a breakpoint, decrement the PC if necessary on the lwp's
510 architecture. Returns true if we now have the LWP's stop PC. */
511 bool save_stop_reason (lwp_info
*lwp
);
513 /* Resume execution of LWP. If STEP is nonzero, single-step it. If
514 SIGNAL is nonzero, give it that signal. */
515 void resume_one_lwp_throw (lwp_info
*lwp
, int step
, int signal
,
518 /* Like resume_one_lwp_throw, but no error is thrown if the LWP
519 disappears while we try to resume it. */
520 void resume_one_lwp (lwp_info
*lwp
, int step
, int signal
, siginfo_t
*info
);
522 /* This function is called once per thread. We check the thread's
523 last resume request, which will tell us whether to resume, step, or
524 leave the thread stopped. Any signal the client requested to be
525 delivered has already been enqueued at this point.
527 If any thread that GDB wants running is stopped at an internal
528 breakpoint that needs stepping over, we start a step-over operation
529 on that particular thread, and leave all others stopped. */
530 void proceed_one_lwp (thread_info
*thread
, lwp_info
*except
);
532 /* This function is called once per thread. We check the thread's
533 resume request, which will tell us whether to resume, step, or
534 leave the thread stopped; and what signal, if any, it should be
537 For threads which we aren't explicitly told otherwise, we preserve
538 the stepping flag; this is used for stepping over gdbserver-placed
541 If pending_flags was set in any thread, we queue any needed
542 signals, since we won't actually resume. We already have a pending
543 event to report, so we don't need to preserve any step requests;
544 they should be re-issued if necessary. */
545 void resume_one_thread (thread_info
*thread
, bool leave_all_stopped
);
547 /* Return true if this lwp has an interesting status pending. */
548 bool status_pending_p_callback (thread_info
*thread
, ptid_t ptid
);
550 /* Resume LWPs that are currently stopped without any pending status
551 to report, but are resumed from the core's perspective. */
552 void resume_stopped_resumed_lwps (thread_info
*thread
);
554 /* Unsuspend THREAD, except EXCEPT, and proceed. */
555 void unsuspend_and_proceed_one_lwp (thread_info
*thread
, lwp_info
*except
);
557 /* Return true if this lwp still has an interesting status pending.
558 If not (e.g., it had stopped for a breakpoint that is gone), return
560 bool thread_still_has_status_pending (thread_info
*thread
);
562 /* Return true if this lwp is to-be-resumed and has an interesting
564 bool resume_status_pending (thread_info
*thread
);
566 /* Return true if this lwp that GDB wants running is stopped at an
567 internal breakpoint that we need to step over. It assumes that
568 any required STOP_PC adjustment has already been propagated to
569 the inferior's regcache. */
570 bool thread_needs_step_over (thread_info
*thread
);
572 /* Single step via hardware or software single step.
573 Return 1 if hardware single stepping, 0 if software single stepping
574 or can't single step. */
575 int single_step (lwp_info
* lwp
);
577 /* Install breakpoints for software single stepping. */
578 void install_software_single_step_breakpoints (lwp_info
*lwp
);
580 /* Fetch the possibly triggered data watchpoint info and store it in
583 On some archs, like x86, that use debug registers to set
584 watchpoints, it's possible that the way to know which watched
585 address trapped, is to check the register that is used to select
586 which address to watch. Problem is, between setting the watchpoint
587 and reading back which data address trapped, the user may change
588 the set of watchpoints, and, as a consequence, GDB changes the
589 debug registers in the inferior. To avoid reading back a stale
590 stopped-data-address when that happens, we cache in LP the fact
591 that a watchpoint trapped, and the corresponding data address, as
592 soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug
593 registers meanwhile, we have the cached data we can rely on. */
594 bool check_stopped_by_watchpoint (lwp_info
*child
);
596 /* Convert a native/host siginfo object, into/from the siginfo in the
597 layout of the inferiors' architecture. */
598 void siginfo_fixup (siginfo_t
*siginfo
, gdb_byte
*inf_siginfo
,
601 /* Add a process to the common process list, and set its private
603 process_info
*add_linux_process (int pid
, int attached
);
605 /* Add a new thread. */
606 lwp_info
*add_lwp (ptid_t ptid
);
608 /* Delete a thread. */
609 void delete_lwp (lwp_info
*lwp
);
611 public: /* Make this public because it's used from outside. */
612 /* Attach to an inferior process. Returns 0 on success, ERRNO on
614 int attach_lwp (ptid_t ptid
);
616 private: /* Back to private. */
617 /* Detach from LWP. */
618 void detach_one_lwp (lwp_info
*lwp
);
620 /* Detect zombie thread group leaders, and "exit" them. We can't
621 reap their exits until all other threads in the group have
623 void check_zombie_leaders ();
625 /* Convenience function that is called when the kernel reports an exit
626 event. This decides whether to report the event to GDB as a
627 process exit event, a thread exit event, or to suppress the
629 ptid_t
filter_exit_event (lwp_info
*event_child
,
630 target_waitstatus
*ourstatus
);
633 /* The architecture-specific "low" methods are listed below. */
635 /* Architecture-specific setup for the current thread. */
636 virtual void low_arch_setup () = 0;
638 /* Return false if we can fetch/store the register, true if we cannot
639 fetch/store the register. */
640 virtual bool low_cannot_fetch_register (int regno
) = 0;
642 virtual bool low_cannot_store_register (int regno
) = 0;
644 /* Hook to fetch a register in some non-standard way. Used for
645 example by backends that have read-only registers with hardcoded
646 values (e.g., IA64's gr0/fr0/fr1). Returns true if register
647 REGNO was supplied, false if not, and we should fallback to the
648 standard ptrace methods. */
649 virtual bool low_fetch_register (regcache
*regcache
, int regno
);
651 /* Return true if breakpoints are supported. Such targets must
652 implement the GET_PC and SET_PC methods. */
653 virtual bool low_supports_breakpoints ();
655 virtual CORE_ADDR
low_get_pc (regcache
*regcache
);
657 virtual void low_set_pc (regcache
*regcache
, CORE_ADDR newpc
);
659 /* Find the next possible PCs after the current instruction executes.
660 Targets that override this method should also override
661 'supports_software_single_step' to return true. */
662 virtual std::vector
<CORE_ADDR
> low_get_next_pcs (regcache
*regcache
);
664 /* Return true if there is a breakpoint at PC. */
665 virtual bool low_breakpoint_at (CORE_ADDR pc
) = 0;
667 /* Breakpoint and watchpoint related functions. See target.h for
669 virtual int low_insert_point (raw_bkpt_type type
, CORE_ADDR addr
,
670 int size
, raw_breakpoint
*bp
);
672 virtual int low_remove_point (raw_bkpt_type type
, CORE_ADDR addr
,
673 int size
, raw_breakpoint
*bp
);
675 virtual bool low_stopped_by_watchpoint ();
677 virtual CORE_ADDR
low_stopped_data_address ();
679 /* Hooks to reformat register data for PEEKUSR/POKEUSR (in particular
680 for registers smaller than an xfer unit). */
681 virtual void low_collect_ptrace_register (regcache
*regcache
, int regno
,
684 virtual void low_supply_ptrace_register (regcache
*regcache
, int regno
,
687 /* Hook to convert from target format to ptrace format and back.
688 Returns true if any conversion was done; false otherwise.
689 If DIRECTION is 1, then copy from INF to NATIVE.
690 If DIRECTION is 0, copy from NATIVE to INF. */
691 virtual bool low_siginfo_fixup (siginfo_t
*native
, gdb_byte
*inf
,
694 /* Hook to call when a new process is created or attached to.
695 If extra per-process architecture-specific data is needed,
697 virtual arch_process_info
*low_new_process ();
699 /* Hook to call when a process is being deleted. If extra per-process
700 architecture-specific data is needed, delete it here. */
701 virtual void low_delete_process (arch_process_info
*info
);
703 /* Hook to call when a new thread is detected.
704 If extra per-thread architecture-specific data is needed,
706 virtual void low_new_thread (lwp_info
*);
708 /* Hook to call when a thread is being deleted. If extra per-thread
709 architecture-specific data is needed, delete it here. */
710 virtual void low_delete_thread (arch_lwp_info
*);
712 /* Hook to call, if any, when a new fork is attached. */
713 virtual void low_new_fork (process_info
*parent
, process_info
*child
);
715 /* Hook to call prior to resuming a thread. */
716 virtual void low_prepare_to_resume (lwp_info
*lwp
);
718 /* How many bytes the PC should be decremented after a break. */
719 virtual int low_decr_pc_after_break ();
722 extern linux_process_target
*the_linux_target
;
724 #define get_thread_lwp(thr) ((struct lwp_info *) (thread_target_data (thr)))
725 #define get_lwp_thread(lwp) ((lwp)->thread)
727 /* This struct is recorded in the target_data field of struct thread_info.
729 On linux ``all_threads'' is keyed by the LWP ID, which we use as the
730 GDB protocol representation of the thread ID. Threads also have
731 a "process ID" (poorly named) which is (presently) the same as the
734 There is also ``all_processes'' is keyed by the "overall process ID",
735 which GNU/Linux calls tgid, "thread group ID". */
739 /* Backlink to the parent object. */
740 struct thread_info
*thread
;
742 /* If this flag is set, the next SIGSTOP will be ignored (the
743 process will be immediately resumed). This means that either we
744 sent the SIGSTOP to it ourselves and got some other pending event
745 (so the SIGSTOP is still pending), or that we stopped the
746 inferior implicitly via PTRACE_ATTACH and have not waited for it
750 /* When this is true, we shall not try to resume this thread, even
751 if last_resume_kind isn't resume_stop. */
754 /* If this flag is set, the lwp is known to be stopped right now (stop
755 event already received in a wait()). */
758 /* Signal whether we are in a SYSCALL_ENTRY or
759 in a SYSCALL_RETURN event.
761 - TARGET_WAITKIND_SYSCALL_ENTRY
762 - TARGET_WAITKIND_SYSCALL_RETURN */
763 enum target_waitkind syscall_state
;
765 /* When stopped is set, the last wait status recorded for this lwp. */
768 /* If WAITSTATUS->KIND != TARGET_WAITKIND_IGNORE, the waitstatus for
769 this LWP's last event, to pass to GDB without any further
770 processing. This is used to store extended ptrace event
771 information or exit status until it can be reported to GDB. */
772 struct target_waitstatus waitstatus
;
774 /* A pointer to the fork child/parent relative. Valid only while
775 the parent fork event is not reported to higher layers. Used to
776 avoid wildcard vCont actions resuming a fork child before GDB is
777 notified about the parent's fork event. */
778 struct lwp_info
*fork_relative
;
780 /* When stopped is set, this is where the lwp last stopped, with
781 decr_pc_after_break already accounted for. If the LWP is
782 running, this is the address at which the lwp was resumed. */
785 /* If this flag is set, STATUS_PENDING is a waitstatus that has not yet
787 int status_pending_p
;
790 /* The reason the LWP last stopped, if we need to track it
791 (breakpoint, watchpoint, etc.) */
792 enum target_stop_reason stop_reason
;
794 /* On architectures where it is possible to know the data address of
795 a triggered watchpoint, STOPPED_DATA_ADDRESS is non-zero, and
796 contains such data address. Only valid if STOPPED_BY_WATCHPOINT
798 CORE_ADDR stopped_data_address
;
800 /* If this is non-zero, it is a breakpoint to be reinserted at our next
801 stop (SIGTRAP stops only). */
802 CORE_ADDR bp_reinsert
;
804 /* If this flag is set, the last continue operation at the ptrace
805 level on this process was a single-step. */
808 /* Range to single step within. This is a copy of the step range
809 passed along the last resume request. See 'struct
811 CORE_ADDR step_range_start
; /* Inclusive */
812 CORE_ADDR step_range_end
; /* Exclusive */
814 /* If this flag is set, we need to set the event request flags the
815 next time we see this LWP stop. */
816 int must_set_ptrace_flags
;
818 /* If this is non-zero, it points to a chain of signals which need to
819 be delivered to this process. */
820 struct pending_signals
*pending_signals
;
822 /* A link used when resuming. It is initialized from the resume request,
823 and then processed and cleared in linux_resume_one_lwp. */
824 struct thread_resume
*resume
;
826 /* Information bout this lwp's fast tracepoint collection status (is it
827 currently stopped in the jump pad, and if so, before or at/after the
828 relocated instruction). Normally, we won't care about this, but we will
829 if a signal arrives to this lwp while it is collecting. */
830 fast_tpoint_collect_result collecting_fast_tracepoint
;
832 /* If this is non-zero, it points to a chain of signals which need
833 to be reported to GDB. These were deferred because the thread
834 was doing a fast tracepoint collect when they arrived. */
835 struct pending_signals
*pending_signals_to_report
;
837 /* When collecting_fast_tracepoint is first found to be 1, we insert
838 a exit-jump-pad-quickly breakpoint. This is it. */
839 struct breakpoint
*exit_jump_pad_bkpt
;
843 /* The thread handle, used for e.g. TLS access. Only valid if
844 THREAD_KNOWN is set. */
847 /* The pthread_t handle. */
848 thread_t thread_handle
;
851 /* Arch-specific additions. */
852 struct arch_lwp_info
*arch_private
;
855 int linux_pid_exe_is_elf_64_file (int pid
, unsigned int *machine
);
857 /* Attach to PTID. Returns 0 on success, non-zero otherwise (an
859 int linux_attach_lwp (ptid_t ptid
);
861 struct lwp_info
*find_lwp_pid (ptid_t ptid
);
862 /* For linux_stop_lwp see nat/linux-nat.h. */
864 #ifdef HAVE_LINUX_REGSETS
865 void initialize_regsets_info (struct regsets_info
*regsets_info
);
868 void initialize_low_arch (void);
870 void linux_set_pc_32bit (struct regcache
*regcache
, CORE_ADDR pc
);
871 CORE_ADDR
linux_get_pc_32bit (struct regcache
*regcache
);
873 void linux_set_pc_64bit (struct regcache
*regcache
, CORE_ADDR pc
);
874 CORE_ADDR
linux_get_pc_64bit (struct regcache
*regcache
);
876 /* From thread-db.c */
877 int thread_db_init (void);
878 void thread_db_detach (struct process_info
*);
879 void thread_db_mourn (struct process_info
*);
880 int thread_db_handle_monitor_command (char *);
881 int thread_db_get_tls_address (struct thread_info
*thread
, CORE_ADDR offset
,
882 CORE_ADDR load_module
, CORE_ADDR
*address
);
883 int thread_db_look_up_one_symbol (const char *name
, CORE_ADDR
*addrp
);
885 /* Called from linux-low.c when a clone event is detected. Upon entry,
886 both the clone and the parent should be stopped. This function does
887 whatever is required have the clone under thread_db's control. */
889 void thread_db_notice_clone (struct thread_info
*parent_thr
, ptid_t child_ptid
);
891 bool thread_db_thread_handle (ptid_t ptid
, gdb_byte
**handle
, int *handle_len
);
893 extern int have_ptrace_getregset
;
895 /* Search for the value with type MATCH in the auxv vector with
896 entries of length WORDSIZE bytes. If found, store the value in
897 *VALP and return 1. If not found or if there is an error, return
900 int linux_get_auxv (int wordsize
, CORE_ADDR match
,
903 /* Fetch the AT_HWCAP entry from the auxv vector, where entries are length
904 WORDSIZE. If no entry was found, return zero. */
906 CORE_ADDR
linux_get_hwcap (int wordsize
);
908 /* Fetch the AT_HWCAP2 entry from the auxv vector, where entries are length
909 WORDSIZE. If no entry was found, return zero. */
911 CORE_ADDR
linux_get_hwcap2 (int wordsize
);
913 #endif /* GDBSERVER_LINUX_LOW_H */